1211213312 has 40 divisors (see below), whose sum is σ = 2471600736. Its totient is φ = 592709632.

The previous prime is 1211213287. The next prime is 1211213329. The reversal of 1211213312 is 2133121121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1103 + ... + 49230.

Almost surely, 2^1211213312 is an apocalyptic number.

It is an amenable number.

1211213312 is an abundant number, since it is smaller than the sum of its proper divisors (1260387424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211213312 is an frugal number, since it uses more digits than its factorization.

1211213312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50398 (or 50382 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 1211213312 is about 34802.4900258588. The cubic root of 1211213312 is about 1065.9582907811.

Adding to 1211213312 its reverse (2133121121), we get a palindrome (3344334433).

The spelling of 1211213312 in words is "one billion, two hundred eleven million, two hundred thirteen thousand, three hundred twelve".